摘 要 ：利用基因工程技术 ,将分别克隆在两个不同载体上的甜味蛋白 thaum atin c DNA基因片段连接成一个完整的 c DNA基因 ,并将该基因克隆进 p BI12 1,构建成表达载体 p BI12 1- tha.通过冻融法导入农杆菌 ,农杆菌介导叶盘法转入烟草 ,经过组培 ,得到转基因的植株 .提取转基因烟草总 DNA,经 PCR,PCR- Southern和 Southern杂交证实 ,甜味蛋白基因已整合到烟草基因组中 .RT- PCR结果证明 ,thaumatin基因已在转基因烟草中转录成 m RNA,但SDS- PAGE和甜味尝试都表明 thaumatin基因在转基因烟草中没有表达出甜味蛋白
Abstract:Two fragments of thaumatin cDNA were cloned in different vectors.By use of genetic technology,the two fragments were ligated into a complete thaumatin cDNA and cloned into the vector pBI121,resulting in an expression vector pBI121. After successful constr